US Bridges

Bond Road over Onehourse Slough

Fair

Linn County, Oregon · 006 MI S CR 20L · Structure no. 11992 066600378

Built
1972
53 years old
Condition
Fair
inspected June 2023
Type
Slab
Prestressed Concrete
Length
45 ft
2 main spans
Daily traffic
360
2021 count
Owner
County
County Highway Agency

About this bridge

Bond Road over Onehourse Slough is a prestressed concrete slab carrying Bond Road over Onehourse Slough in Linn County, Oregon. It was built in 1972, so it is 53 years old, older than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 360 vehicles a day, roughly 10% of them trucks, projected to reach 515 by 2041. The structure is 45 ft (13.7 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesBond Road
CrossesOnehourse Slough
Location006 MI S CR 20L
RouteCounty Highway C0666
CountyLinn County
StateOregon
Coordinates44.56915, -122.83457
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.7 US tons
Inventory rating35.4 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans2
Design loadHS 20
Structure length45 ft (13.7 m)
Longest span21 ft (6.4 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic360 (2021)
Projected traffic515 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$299,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Bond Road over Onehourse Slough built?

It was built in 1972, making it 53 years old in 2025.

What condition is Bond Road over Onehourse Slough in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2023.

How much traffic does Bond Road over Onehourse Slough carry?

About 360 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is Bond Road over Onehourse Slough?

The structure is 45 ft (13.7 m) long with a longest span of 21 ft (6.4 m) and a deck 28 ft wide.

Who owns Bond Road over Onehourse Slough?

It is owned by the County Highway Agency.